Gary Girodat, 49, of Fargo, N.D., appeared confused in a video licensed by Caters News as he was "ticketed" for “driving like a grandpa,” until a sonogram on the following page revealed he would be expecting his first grandchild.

“He had absolutely no clue,” his son and father-to-be Damien Girodat, 28, told InsideEdition.com.

Damien, a police officer in Bismarck, explained that he and his wife, Rachel, 26, wanted to surprise his father in a unique way.

While visiting his dad, he decided to contact a friend at the local police department, who was happy to help him out with the surprise.

After clearing it with the department, Damien said the officer waited in a parking lot until the family drove by. He then pulled them over, citing a faulty tail light.